Vented nozzle



Dec.'21, 1937.

F. D. CAMPBELL VENTED NOZ ZLE Original Filed Nov. 14, 195 1 2Sheets-Sheet l Dec. 21, 1937 F. D. CAMPBELL VENTED NOZZLE Original FiledNov. 14, 1931 2 Sheets-Sheet 2 X aw Patented Dec. 21, 1937 I UNITEDSTATES 2,102,786 VENTED NOZZLE Frank D. Campbell, Cedar Rapids, Iowa,assignor to The Quaker Oats Company, Chicago, 111., a corporation of NewJersey Original application November 14, 1931, Serial No, 575,086, nowPatent No. 2,036,681, dated April 7, 1936. Divided and this applicationSeptember 19, 1935, Serial No. 41,213

3 Claims.

My invention relates to the extrusion of cooked plastic material.

This application is a division of my copending application Serial No.575,086, filed November 14, 1931, which has matured into Pat. No.2,036,-

681 of April 7, 1936.

One of the objects of my invention is to provide improved apparatus forextruding a tube of plastic material subject to internal pressure,having provisions for preventing the internal pressure from rupturingthe tube or causing it to swell too much.

A further object is to provide an extrusion nozzle having provisionswhereby it may be made adjustable to vary the flow of plastic materialand to facilitate the flow of material in case it becomes clogged.

Further objects will appear from the description and claims.

In the drawings, in which an embodiment of my invention is shown, 7

Figure l is a vertical sectional view showing an extrusion cylinder andcooker with which my improved nozzle is used;

Fig. 2 is an axial section of the nozzle;

Fig. 3 is a section on line 3-3 of Fig. 2; and

Fig. 4 is a section on the line 4--4 of Fig. 2. Referring to thedrawings in detail, the con struction shown comprises an extrudingcylinder 30 I, an extruding piston 2 for extruding the plastic materialfrom the cylinder, a vertical tubular member 3 through which the plasticmaterial is forced from the cylinder I, a horizontal tubular member 4through which the material is forced from the vertical tubular member 3,a cooking cylinder 5 to which the plastic material is supplied from thehorizontal tubular member 4, and an extrusion nozzle 6 leading from thecooking cylinder. The extrusion nozzle is designed to extrude the cookedplastic food material in the form of a plastic tube 7, as shown in Fig.2.

In order to prevent the tube of extruded material' from rupturing, dueto the formation of steam within the tube on being released from theextrusion nozzle, an air vent 8 is provided as shown in Fig. 2 throughthe central core 9 of the extrusion nozzle 6. This vent reduces thepressure in the tube I below the rupture point, although sufiicientpressure may be developed to cause a slight expansion of the tube onleaving the nozzle. This central core 9 is made axially adjustable inorder to enable the flow of plastic material to be varied and tofacilitate the flow of material in case it becomes clogged. This axialadjustment is effected by providing a screw (c1. mi -14 threadedconnection I0 between the upper end of the core 9 and the retaining nutI I for the packing gland I2.

To enable the ring portion I3 of the extrusion nozzle to be accuratelycentered with respect to the core portion 9, it is made laterallyshiftable in a retaining nut I4 threaded on the lower end of the nozzle.Lateral adjustment of the ring in any direction may be effected by theuse of the three adjusting screws I5 shown in Figs. 2 and 4.

The dough or other plastic material flows from the cooking cylinder 5through the annular space between the core 9 and the bore in the nozzle6 and thence through the annular space between the ring portion I3 andthe tip portion of the core, causing the dough to be extruded in tubularform.

The cooker construction shown in section in Fig. 1 comprises a steamchamber I6 having a steam inlet I1 and outlet I8 and a plurality oftubes I9 leading from one end to the other of the steam chamber throughwhich the dough or other plastic material is forced from the tubularmember 4.

The ends of the tubes are seated in the header plates 20 and 2I whichare so constructed that the entire nest of tubes and header plates maybe removed as a unit from the steam chamber for purposes of cleaning orrepairing. To enable this to be accomplished, the right-hand headerplate 2| is made slightly smaller in diameter than the internal diameterof the steam chamber 16 so that by removing the nuts 22 anddisconnecting the cooker from the header, the entire nest of dough tubesI9 may be slipped out of the steam chamber I6 by moving the nest oftubes to the left (Fig. 1).

In order to enable the attendant to prevent the dough in the dough tubesfrom getting burnt in case the flow of dough is temporarily suspended,means are provided for cutting off the supply of steam to the steamchamber and for admitting a supply of cold water thereto through thewater supply pipe 23 leading to the steam chamber I6.

It will be seen that the nozzle construction disclosed has provision forrelieving the internal pressure in the plastic tube, thus preventing thetube from rupturing or swelling too much.

Modifications will be apparent to those skilled in the art, and Idesire, therefore, to be limited only by the prior art and the scope ofthe appended claims.

Having thus described my invention, what I claim and desire to secure byLetters Patent is:

l. A nozzle construction for extruding a tube of plastic materialsubject to internal pressure, comprising a casing having an inlet and anoutlet for the passage of the plastic material, a core in said casingand extending into said outlet to provide an annular orifice, and apacking gland through which said core passes, said core having a ventpassage afiording communication between the interior of the tube and theatmosphere and passing through said packing gland.

2. A nozzle construction for extruding a tube of plastic materialsubject to internal pressure, comprising a casing having an inlet and anoutlet for the passage of the plastic material, a core in said casingand extending into said outlet to provide an annular orifice, and apacking gland through which said core passes, said core having a ventpassage affording communication between the interior of the tube and theatmosphere and passing through said packing gland, said core beingaxially adjustable in said packing gland to vary the flow of plasticmaterial and to facilitate the flow of material in case it becomesclogged.

3, Apparatus for forming a tubing from plastic material containingmoisture comprising means for heating a plastic moisture containingmaterial to a temperature above the atmospheric boiling point of themoisture, an extruding nozzle construction, and means for forcing theheated plastic material into and through the extruding nozzle, saidextruding nozzle construction comprising an annular orifice having acentral core, said core having an open passage leading from the interiorof the extruded tube to the atmosphere to relieve the internal pressurein the tube due to the gas formed as the extruded materialleaves thenozzle.

FRANK D. CAMPBELL.

